hi, i have a 77 chevy motor 400 bored .30 over(406) w/10.5:1 compression ratio. it also has a set of world products sportsman 2 heads on it. my question is does anybody have the paperwork that came with your sportsman 2 heads to tell you what plugs you should put in it. if you do, can i get a copy of it? or, if you have any recommendations, id like to hear some. thanks for any help.

Spark Plugs: Sportsman II heads use a 5/8 reach plug such as an Accel 276 or equivalent. Sportsman II heads with angle plugs, an Accel 276S may be used to gain additional header to spark plug clearance.
Strait from their website.:D

Recommend the 276S plug even with straight plug heads as you gain an extra 3/8th inch more clearance with the shorter plug.

Larger Dave